Examples

If you are having trouble finding a range in your area and you live in the country you can build your own backstop by mounding up a dirt pile about 4 feet high and 6 feet long and shoot into that, just make sure the area behind the backstop is safe.

Also, it should be noted that this approach of import-allowance-requirements is included as a long-term backstop in Waxman-Markey if the president determines by 2022 that the output-based allocation mechanism is insufficient for some of the energy-intensive trade-sensitive sectors (and if a number of stringent conditions are met; see the "International Reserve Allowance Program" in the bill).